There seems to be a general consensus that people shouldn't implement their own cryptography but rather rely on pre-existing standards.

Should we permit questions that discuss implementing a standard (AES, PGP, etc) in contrast to homebrew crypto that isn't affiliated (or diverges from) a known standard?

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Where the implementation is something a security professional has to be aware of, then this should be on-topic, however if it is the case that the question is purely a coding one (ie it isn't about security decisions, but is about coding or configuration) then I would feel it would be offtopic here, but possibly better served on SO, SF, SU or even one of the specific sites such as Ask, Android etc.

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Agreed. On the other hand, if it is about the details of the algorithm, then it would be better on Crypto. –  AviD Jan 2 '13 at 21:52
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Seems like how the algorithm works is crypto, how the algorithm is used is Security and how the algorithm is implemented is StackOverflow. –  AJ Henderson Jan 4 '13 at 3:23
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@AJHenderson and whether [hipster language of the week] is the "best" language for implementing it is Programmers. –  user185 Jan 14 '13 at 11:08

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